package com.cc.oss.service.impl;

import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.cc.oss.service.OssService;
import com.cc.oss.utils.OssUtils;
import org.joda.time.DateTime;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.UUID;

@Service
public class OssServiceImpl implements OssService {
    @Override
    public String upload(MultipartFile file) {
        String endPoint = OssUtils.END_POINT;
        String accessKeyId = OssUtils.ACCESS_KEY_ID;
        String accessKeySecret = OssUtils.ACCESS_KEY_SECRET;
        String bucketName = OssUtils.BUCKET_NAME;
        OSS ossClient = new OSSClientBuilder().build(endPoint, accessKeyId, accessKeySecret);
        String filename = file.getOriginalFilename();
        String uuid = UUID.randomUUID().toString().replace("-", "");
        filename = uuid + filename;
        String date = new DateTime().toString("yyyy/MM/dd");
        filename = date + filename;
        try {
            InputStream inputStream = file.getInputStream();
            ossClient.putObject(bucketName, filename, inputStream);
            String url = "https://" + bucketName + "." + endPoint + "/" + filename;
            return url;
        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;
    }

    @Override
    public String uploadPicByPhoneCamera(MultipartFile file) {
        String endPoint = OssUtils.END_POINT;
        String accessKeyId = OssUtils.ACCESS_KEY_ID;
        String accessKeySecret = OssUtils.ACCESS_KEY_SECRET;
        String bucketName = OssUtils.BUCKET_NAME;
        OSS ossClient = new OSSClientBuilder().build(endPoint, accessKeyId, accessKeySecret);
        String filename = file.getOriginalFilename();
        String uuid = UUID.randomUUID().toString().replace("-", "");
        filename = uuid + filename;
        String date = new DateTime().toString("yyyy/MM/dd");
        filename = date + filename;
        try {
            InputStream inputStream = changePictureAngle(file);
            ossClient.putObject(bucketName, filename, inputStream);
            String url = "https://" + bucketName + "." + endPoint + "/" + filename;
            return url;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    public static InputStream changePictureAngle(MultipartFile f) {
        Image src = null;
        int angel = 0;
        try {
            src = ImageIO.read(f.getInputStream());
            File file = File.createTempFile("tmp", null);
            f.transferTo(file);
            file.deleteOnExit();
            angel = 180;
        } catch (IOException e) {
            e.printStackTrace();
        }
        int src_width = src.getWidth(null);
        int src_height = src.getHeight(null);
        // calculate the new image size
        Rectangle rect_des = CalcRotatedSize(new Rectangle(new Dimension(src_width, src_height)), angel);

        BufferedImage res = new BufferedImage(rect_des.width, rect_des.height, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2 = res.createGraphics();
        // transform
        g2.translate((rect_des.width - src_width) / 2, (rect_des.height - src_height) / 2);
        g2.rotate(Math.toRadians(angel), src_width / 2, src_height / 2);
        g2.drawImage(src, null, null);
        ByteArrayOutputStream bs = new ByteArrayOutputStream();
        try {
            ImageOutputStream imOut = ImageIO.createImageOutputStream(bs);
            ImageIO.write(res, "jpg", imOut);
        } catch (IOException e) {
            e.printStackTrace();
        }
        InputStream is = new ByteArrayInputStream(bs.toByteArray());
        return is;
    }

    public static Rectangle CalcRotatedSize(Rectangle src, int angel) {
        // if angel is greater than 90 degree, we need to do some conversion
        if (angel >= 90) {
            if (angel / 90 % 2 == 1) {
                int temp = src.height;
                src.height = src.width;
                src.width = temp;
            }
            angel = angel % 90;
        }
        double r = Math.sqrt(src.height * src.height + src.width * src.width) / 2;
        double len = 2 * Math.sin(Math.toRadians(angel) / 2) * r;
        double angel_alpha = (Math.PI - Math.toRadians(angel)) / 2;
        double angel_dalta_width = Math.atan((double) src.height / src.width);
        double angel_dalta_height = Math.atan((double) src.width / src.height);
        int len_dalta_width = (int) (len * Math.cos(Math.PI - angel_alpha
                - angel_dalta_width));
        int len_dalta_height = (int) (len * Math.cos(Math.PI - angel_alpha
                - angel_dalta_height));
        int des_width = src.width + len_dalta_width * 2;
        int des_height = src.height + len_dalta_height * 2;
        return new Rectangle(new Dimension(des_width, des_height));
    }
}
